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ASTM A227 Spring Steel vs. EN 1.7239 Steel

Both ASTM A227 spring steel and EN 1.7239 steel are iron alloys. Their average alloy composition is basically identical. There are 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is EN 1.7239 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
200 to 480
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
660 to 1990

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
44
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 46
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 61 to 79
23 to 71
Strength to Weight: Bending, points 41 to 48
21 to 45
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 55 to 71
19 to 59

Alloy Composition

Carbon (C), % 0.45 to 0.85
0.56 to 0.64
Chromium (Cr), % 0
0.7 to 1.0
Iron (Fe), % 97.4 to 99.1
96.8 to 98
Manganese (Mn), % 0.3 to 1.3
0.7 to 1.0
Molybdenum (Mo), % 0
0.060 to 0.15
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.050
0 to 0.025

Comparable Variants